package controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.Blog;
import model.BlogDao;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/authorInfo")
public class AuthorServlet extends HttpServlet {
    private ObjectMapper objectMapper=new ObjectMapper();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("application/json;charset=utf8");
        //通过这个方法,来获取到指定博客的作者信息
        String param =req.getParameter("blogId");
        if(param==null||"".equals(param)){
            //参数缺少了
            resp.getWriter().write("{\"ok\": false. \"reason\": \"参数缺失!\"}");
            return;
        }

        //根据当前blogId在数据库中进行 查找,找到对应的Blog对象,再进一步的根据blog对象,找到作者信息.
        BlogDao blogDao=new BlogDao();
      Blog blog=blogDao.selectOne(Integer.parseInt(param));
      if(blog==null){
          resp.getWriter().write("{\"ok\": false. \"reason\": \"要查询的博客不存在!\"}");
          return;
      }
        //根据blog对象,查询到用户对象
        UserDao userDao=new UserDao();
      User author=userDao.selectById(blog.getUserId());
      if(author==null){
          resp.getWriter().write("{\"ok\": false. \"reason\": \"要查询的用户不存在!\"}");
          return;
      }

      //把author返回给浏览器
        //注意要把密码给干掉
        author.setPassword("");
        resp.getWriter().write(objectMapper.writeValueAsString(author));
    }
}
